CVE-2026-39806 HTTP/1 chunked decoder infinite loop on requests with trailer fields in bandit

Loop with Unreachable Exit Condition 'Infinite Loop' vulnerability in mtrudel bandit allows unauthenticated remote denial of service via worker process exhaustion. 'Elixir.Bandit.HTTP1.Socket':doreadchunkeddata!/5 in lib/bandit/http1/socket.ex terminates only when the last-chunk line 0\r\n is...

CVE-2026-39806

Loop with Unreachable Exit Condition 'Infinite Loop' vulnerability in mtrudel bandit allows unauthenticated remote denial of service via worker process exhaustion. 'Elixir.Bandit.HTTP1.Socket':doreadchunkeddata!/5 in lib/bandit/http1/socket.ex terminates only when the last-chunk line 0\r\n is...

CVE-2026-39806 HTTP/1 chunked decoder infinite loop on requests with trailer fields in bandit

Loop with Unreachable Exit Condition 'Infinite Loop' vulnerability in mtrudel bandit allows unauthenticated remote denial of service via worker process exhaustion. 'Elixir.Bandit.HTTP1.Socket':doreadchunkeddata!/5 in lib/bandit/http1/socket.ex terminates only when the last-chunk line 0\r\n is...

CVE-2026-39806

The CVE-2026-39806 issue affects Bandit (Elixir.Bandit.HTTP1.Socket) where do_read_chunked_data!/5 loops indefinitely when a chunked request includes trailer fields. The root cause is that RFC 9112 §7.1.2 allows trailers after the 0-length chunk, but the code exits only when the next line is imme...

EEF-CVE-2026-39806 HTTP/1 chunked decoder infinite loop on requests with trailer fields in bandit

Summary Loop with Unreachable Exit Condition 'Infinite Loop' vulnerability in mtrudel bandit allows unauthenticated remote denial of service via worker process exhaustion. 'Elixir.Bandit.HTTP1.Socket':do\read\chunked\data!/5 in lib/bandit/http1/socket.ex terminates only when the last-chunk line...

CVE-2026-39806 HTTP/1 chunked decoder infinite loop on requests with trailer fields in bandit

Loop with Unreachable Exit Condition 'Infinite Loop' vulnerability in mtrudel bandit allows unauthenticated remote denial of service via worker process exhaustion. 'Elixir.Bandit.HTTP1.Socket':doreadchunkeddata!/5 in lib/bandit/http1/socket.ex terminates only when the last-chunk line 0\r\n is...

CVE-2026-39803 HTTP/1 chunked body reader ignores length cap in bandit

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':readdata/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when...

CVE-2026-39803

CVE-2026-39803 – Bandit (Elixir) memory exhaustion via chunked HTTP/1 bodies. The issue occurs in the chunked path of Elixir.Bandit.HTTP1.Socket.read_data/2 where the caller-supplied length is ignored; every received chunk is buffered into an iolist and the entire body is materialized as a single...

CVE-2026-39803 HTTP/1 chunked body reader ignores length cap in bandit

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':readdata/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when...

CVE-2026-39803

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':readdata/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when...

CVE-2026-39803 HTTP/1 chunked body reader ignores length cap in bandit

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':readdata/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when...

EEF-CVE-2026-39803 HTTP/1 chunked body reader ignores length cap in bandit

Summary Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':read\data/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length opti...

PT-2026-40608

Name of the Vulnerable Software and Affected Versions bandit versions 1.6.1 through 1.11.0 Description An infinite loop in the do read chunked data!/5 function within lib/bandit/http1/socket.ex allows unauthenticated remote attackers to cause a denial of service via worker process exhaustion. The...

Bandit 安全漏洞

Bandit is a high-performance HTTP and WebSocket server developed by Mat Trudel. Versions of Bandit from 1.4.0 to 1.11.1 contained security vulnerabilities. These vulnerabilities stemmed from unlimited resource allocation, which could allow unauthenticated remote attackers to cause denial-of-servi...

Bandit 安全漏洞

Bandit is a high-performance HTTP and WebSocket server developed by Mat Trudel. Versions of Bandit from 1.6.1 to 1.11.1 contained security vulnerabilities. These vulnerabilities were caused by infinite loops, which could allow unauthenticated remote attackers to exploit the system through...

PT-2026-40607

Name of the Vulnerable Software and Affected Versions bandit versions 1.4.0 through 1.11.0 Description An unauthenticated remote attacker can cause a denial of service via memory exhaustion. The read data/2 function in Elixir.Bandit.HTTP1.Socket ignores the :length option when processing HTTP/1...

CVE-2026-39807

A flaw was found in bandit. An unauthenticated client can exploit this vulnerability by spoofing the transport state on plaintext HTTP connections. By declaring an HTTPS scheme over a non-secure TCP connection, the system incorrectly registers the connection as secure. This can lead to sensitive...

Bandit HTTP/2 Frame Size Limit Bypass via Late Buffer Check Enables Memory Exhaustion

Summary Bandit's HTTP/2 parser checks frame size after it has already buffered the full body, instead of when it sees the 9-byte header. A peer can announce a 16 MiB frame on a connection that agreed to 16 KiB frames and the server will silently buffer up to 1024× the agreed budget per connection...

EUVD-2026-26716

Bandit HTTP/2 Frame Size Limit Bypass via Late Buffer Check Enables Memory Exhaustion...

GHSA-Q6V9-R226-V65F Bandit HTTP/2 Frame Size Limit Bypass via Late Buffer Check Enables Memory Exhaustion

Summary Bandit's HTTP/2 parser checks frame size after it has already buffered the full body, instead of when it sees the 9-byte header. A peer can announce a 16 MiB frame on a connection that agreed to 16 KiB frames and the server will silently buffer up to 1024× the agreed budget per connection...